Sutin wrote what I'd call the best biography of P. K. Dick, so when this one got recommended to me by meliny, I was all over it.
If you're a Crowley afficionado of any stripe:
1: if you've read it, then
A: have you read this book?
B: what did you think of it?
C: are there points therein that needed rebutting?
2: if you have or have not read it, then
A: how do you think I should approach characterizing the Great Beast in fiction?
B: are there resources you'd recommend I consult in such an undertaking?
While in India, Crowley discovers, rather than esoteric 'how to win friends and influence people' magic, magic that enables him to do such things as levitate battleships. His interest in serving King and Country (as evidenced in our world by his efforts to work in the Intelligence service during WW1) is translated into effective works for King and Country by training magi to feats of magic that end WW1 in about 1/4th the time it ended in our reality. He garners a Barony out of it, and becomes a rather influential creature in the House of Lords: somewhere between eminence gris and enfant terrible.
The novel would not be focusing on Crowley himself- he'll be a secondary character at most (though more likely, will be not even tertiary)- instead, it'll be focused on the young nobility whose parents got through WW1 OK and are trying to find a purpose for their lives, with a desperation that makes Evelyn Waugh and T.S. Eliot's characterizations look like a bunch of Morally-Certain Puritans.
Meanwhile, Germany investigates means of harnessing the energies that Britain's learned, in the interests of paying off their war debt faster...